Abstract
Pollen morphology of Agropyron cristatum (L.) Gaertner. s.s. (subsp. incanum (Náb?lek) Melderis and subsp. pectinatum (M. Bieb.) Tzvelev, latter including var. pectinatum and var. imbricatum (Roemer & Schultes) G. Beck) in Turkey has been studied by using light microscope and scanning electron microscope. The above-mentioned taxa are homogenous in both aperture type and exine ornamentation. Pollen grains are monoporate (rarely diporate in the case of var. imbricatum) having scabrate grouped exine surface. The scabra density and the height of scabrae as well as other morphological parameters such as annulus and operculum diameter are peculiar features for differentiation of taxa. Two different phenograms were created with the UPGMA (Unweighted Pair Group Method with Arithmetic mean) clustering technique using quantitative measurements of the pollen grains. Keywords: Agropyron; Pollen morphology; SEM; Turkey.DOI: 10.3329/bjpt.v16i1.2743Bangladesh J. Plant Taxon. 16(1): 21-28, 2009 (June)
Highlights
The taxonomy of Agropyron Gaertner (Poaceae) was studied in different ways by various researchers
It was once thought to be one of the largest genera encompassing more than 100 species in the tribe Triticeae Dumort (Dewey, 1983)
The aim of this paper is to describe the palynological features of three taxa of the genus Agropyron available in Turkey and to contribute to their taxonomy showing some differences between them regarding their exine sculptures
Summary
The taxonomy of Agropyron Gaertner (Poaceae) was studied in different ways by various researchers. Agropyon has been restricted to the species with P genome composed of three ploidy levels (2x = 14, 4x = 28, 6x = 42) (Dewey and Asay, 1975; Melderis, 1978; Dewey, 1983; Assadi, 1995; Jensen et al, 2006). This narrow concept of Agropyron has been accepted by many authorities. The major Eurasian floras have followed the generic concept of Nevski (Tzvelev, 1976; Melderis et al, 1980; Melderis, 1985)
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